Molecular Dynamics Investigation of Residual Stress and Surface Roughness of Cerium under Diamond Cutting.

Yao Li,Haibing Zheng,Tao Sun,Yang Yang,Maobing Shuai,Junjie Zhang

doi:10.3390/mi9080386

Abstract

Machined surface quality in terms of residual stress and surface roughness has an important influence on the performance of devices and components. In the present work, we elucidate the formation mechanisms of residual stress and surface roughness of single crystalline cerium under ultraprecision diamond cutting by means of molecular dynamics simulations. Influences of machining parameters, such as the rake angle of a cutting tool, depth of cut, and crystal orientation of the workpiece on the machined surface quality were also investigated. Simulation results revealed that dislocation activity and lattice distortion are the two parallel factors that govern the formation of both residual stress and surface roughness. It was found that both distributions of residual stress and surface roughness of machined surface are significantly affected by machining parameters. The optimum machining parameters for achieving high machined surface quality of cerium by diamond cutting are revealed.

Highlights

Cerium, as a lanthanide element with an atomic number of 58, is an important rare earth material
The deformation behavior of cerium under diamond cutting is complex for its unique chemical, physical, and mechanical properties
The phase transformation-induced modification of the electronic structure and bonding configuration in cerium inevitably has a strong impact on its deformation behavior

Summary

Introduction

As a lanthanide element with an atomic number of 58, is an important rare earth material. It is critical to improve machined surface quality of cerium by gaining fundamental understanding of formation mechanisms of residual stress and surface roughness, as well as their dependence on machining parameters. Ultraprecision diamond cutting is an important mechanical machining technique for achieving high machined surface quality [1,2,3].

Results

Conclusion